1. Go to o your store admin panel. Navigate to Extensions -> Extension installer. 2. Click on the upload button. A dialog box should open. 3. Locate the installation file of this extension(category_wall.ocmod.zip) and select it. 4. Now this module should be visible in Extensions -> Modules. After locating it in the Module list just click the install button (“ + ” sign) Then edit this installed module and configure it as you want. 5. Go to Extensions -> Modifications and click the Refresh sign at the upper right corner of the page. 6. After you have set up the module correctly, you can assign it to a specific layout from System > Design > Layouts. This is done by choosing a layout and adding the module. After you are done , You need to click Save.